Bottom line: You’ll see that on the 1918-D Mercury Dime, there’s a small mint mark D after the “ONE” in “ONE DIME.” Otherwise, the 1918-D Mercury Dime is almost identical to the 1916-D ...

A coin with dates that span two World Wars, the Great Depression, and more than three decades of American history, the Mercury dime is an icon of the early 20th century. It can also be worth a lot.